GE Logiq 9 Service Manual

GE MEDICAL SYSTEMS PROPRIETARY TO GE
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IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-11
5-3-3 Scan Control Board (SCB, SCB2)
The Scan Control Board combines onto one board the basic functionality of Image Port (IP), Front End 
Control and Timing (FECT), Scan Sequencer (SS2) and the Scan Trigger (System Timing).
A PCI Slave provides communication to the Scan Control Board. The Scan Control Board only supports 
64 MB of image memory. The IP2...

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-12 Section 5-3 - Front End Processor
5-3-3-1 SCB, SCB2 High Level Features
• Generates and buffers system clocks:
- 40 MHz (40P0 and 40P1)
- 10 Mhz (BPCLK)
-TXSync
- RxSync
• Configures the beamformer to fire B/M-Mode, Color, or PW Doppler vectors.
• Controls scan sequencing in real-time; setting the vector firing order and timing intervals.
• PCI interface to Back End Processor (BEP), BMP, and EQ or...

GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-13
Table 5-4    SCB2 2365739 LED Indications
LED 
Number
LED ColorLED Function
DS1 Green FPGA Programming Done (Passed)
DS2 Red i960 Fail
DS5 Green Toggles during Image Port Frames
DS6RedToggles during Image Port Frames
DS7RedCrash
DS8YellowFIFO Error
DS9 Yellow Command Pause
DS10 Yellow Unused
DS11 Yellow Pause
DS12GreenUnused
DS13GreenHappy Light (toggles...

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-14 Section 5-3 - Front End Processor
5-3-4 Equalization (EQ) Board
5-3-4-1 General Description
The EQ dynamically gains and filters the received signal output from the final beamformer sum. TGC 
control calculates range dependent analog and digital gains. The digital gain is applied to the I/Q signal. 
The gained signal is then rotated in frequency to place the frequency of interest in the passband of...

GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-15
5-3-4-2 Basic Functions
• Compensates for the attenuation of the transmitted signal in tissue by depth: performs TGC based 
on focal zone.
• Compensates for frequency shift (TFC) in tissue, needed in B-Mode and M-Mode.
• Filters out harmonics and optimizes signal to noise ratio.
• Delivers amplified and corrected I & Q data to the BMP and the Scan Control...

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-16 Section 5-3 - Front End Processor
5-3-4-8 Signal Processing
The signal path includes TGC (time gain compensation) followed by TFC (time frequency 
compensation). All reductions in data precision are done via rounding. Overflows are prevented by 
providing clamping when necessary.
5-3-4-9 Time Gain Compensation (TGC)
The TGC block provides analog gain control to the frontend analog signal path and...

GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-17
5-3-5 B/M Mode Processor (BMP) Board
5-3-5-1 General Description
The B/M-mode Processor (BMP) subsystem takes the digital complex data from the EQ subsystem and 
converts it to either B-mode (2D) or M-mode (timeline) data.
• Processes I & Q data for B-Mode and M-Mode imaging.
• Calculates echo signal’s amplitude.
• Converts sample rate to display rate.
•...

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-18 Section 5-3 - Front End Processor
5-3-5-2 Receive Signal Processing
The receive signal processing function performs the majority of the data processing within the BMP 
subsystem. The incoming digital complex data is processed for use with the B-Mode or timeline (M-
Mode) outputs.
The receive signal processing is functionally partitioned into the synthetic aperture, axial interpolation, 
detector and...

GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL 
Chapter 5 Components and Functions (Theory) 5-19
5-3-5-2Receive Signal Processing (cont’d)
•Synthetic Aperture - In synthetic aperture mode, multiple firings from different sets of transducer 
elements are summed to form a single coherent vector. Control of the summing process is provided 
by scan control parameters. The accumulate and synthesis (sum) operations are also used for B-
Flow data processing....

GE MEDICAL SYSTEMSPROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3  LOGIQ™ 9 PROPRIETARYMANUAL   
5-20 Section 5-3 - Front End Processor
5-3-5-2Receive Signal Processing (cont’d)
•Edge Enhance - The edge enhance filter block enhances the high frequency components of high 
amplitude signals corresponding to edges of structures. The filter coefficients will vary with different 
rate conversion on B or M vectors, due to depth or display size differences (including zoomed and 
dual images), or due to...